Preparation and characterization of photoactive composite kaolinite/TiO2

Kutláková, Kateřina Mamulová; Tokarský, Jonáš; Kovář, Pavel; Vojtěšková, S.; Kovářová, A.; Smetana, Bedřich; Kukutschová, Jana; Čapková, Pavla; Matějka, Vlastimil

doi:10.1016/j.jhazmat.2011.01.106

Cited by 121 publications

(40 citation statements)

References 49 publications

(53 reference statements)

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“…However, the synthesis of nanostructures composed of TiO 2 and swellable clay minerals has been recently reported, the nanostructures exhibiting photocatalytic properties even higher than those of commercial Degussa P25 TiO 2 [6]. As the heterogeneous photocatalytic reactions occur on the surface of the catalysts, adsorption of the substrate molecules onto the TiO 2 particles is a critical point for their degradation [7][8][9][10][11]. Therefore, in order to increase the number of active surface sites to generate OH• radicals and to improve the interaction with pollutants [10,11], in most of the studies dealing with photocatalysts based on TiO 2 particles, these are dispersed on the surface of silica, alumina, clays or zeolites.…”

Section: Introductionmentioning

confidence: 99%

“…As the heterogeneous photocatalytic reactions occur on the surface of the catalysts, adsorption of the substrate molecules onto the TiO 2 particles is a critical point for their degradation [7][8][9][10][11]. Therefore, in order to increase the number of active surface sites to generate OH• radicals and to improve the interaction with pollutants [10,11], in most of the studies dealing with photocatalysts based on TiO 2 particles, these are dispersed on the surface of silica, alumina, clays or zeolites. Clays are receiving in recent years a large attention as supports for these photocatalysts, since they are able to adsorb organic substances on their external surfaces, as well as within their interlayer spaces, favoring the contact with the photoactive phase [12][13][14][15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

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Photodegradation of 1,2,4-Trichlorobenzene on Montmorillonite–TiO2 Nanocomposites

et al. 2018

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Montmorillonite-TiO 2 nanocomposites were prepared using two different methods (ultrasonic or stirring) and using titanium(IV) isopropoxide as precursor. The solids were characterized by element chemical analysis, X-ray diffraction, FTIR spectroscopy, thermal analyses, and nitrogen adsorption. The evolution of the properties as a function of the preparation method was discussed. These nanocomposites were used as catalysts for the photodegradation of 1,2,4-trichlorobenzene. The degradation pathway and the nature of the by-products were investigated by mass spectrometry.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photodegradation of 1,2,4-Trichlorobenzene on Montmorillonite–TiO2 Nanocomposites

et al. 2018

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“…According to the Scherrer Equation (1) [31], the peak width at half height (FWHM) of crystal lattice diffraction peaks is inversely proportional to the diameter of crystalline grains, so it can be deduced from the local patterns that in Ce0.3/ARM, the average crystalline size of α-Fe2O3 was lower than other samples:…”

Section: Catalytic Activity Of Ce/armmentioning

confidence: 99%

Preparation and Performance of Modified Red Mud-Based Catalysts for Selective Catalytic Reduction of NOx with NH3

Gong

et al. 2018

Catalysts

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Bayer red mud was selected, and the NH 3 -SCR activity was tested in a fixed bed in which the typical flue gas atmosphere was simulated. Combined with XRF, XRD, BET, SEM, TG and NH 3 -Temperature Programmed Desorption (TPD) characterization, the denitration characteristics of Ce-doped red mud catalysts were studied on the basis of alkali-removed red mud. The results showed that typical red mud was a feasible material for denitration catalyst. Acid washing and calcining comprised the best treatment process for raw red mud, which reduced the content of alkaline substances, cleared the catalyst pore and optimized the particle morphology with dispersion. In the temperature range of 300-400 • C, the denitrification efficiency of calcined acid washing of red mud catalyst (ARM) was more than 70%. The doping of Ce significantly enhanced NH 3 adsorption from weak, medium and strong acid sites, reduced the crystallinity of α-Fe 2 O 3 in ARM, optimized the specific surface area and broadened the active temperature window, which increased the NO x conversion rate by an average of nearly 20% points from 250-350 • C. The denitration efficiency of Ce 0.3 /ARM at 300 • C was as high as 88%. The optimum conditions for the denitration reaction of the Ce 0.3 /ARM catalyst were controlled as follows: Gas Hourly Space Velocity (GHSV) of 30,000 h −1 , O 2 volume fraction of 3.5-4% and the NH 3 /NO molar ratio ([NH 3 /NO]) of 1.0. The presence of SO 2 in the feed had an irreversible negative effect on the activity of the Ce 0.3 /ARM catalyst.

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“…The composite kaolinite/TiO 2 containing 60 wt.% of TiO 2 was prepared by a thermal hydrolysis of the suspension of raw kaolin (SAK47, LB minerals) in titanyl sulphate (TiOSO 4 , Precheza a.s.), described in detail in a work published by Mamulová -Kutlaková et al [16]. The prepared composite was assigned KATI16, number 1 signals the sample in state after drying at 100°C, 6 depicts the content of TiO 2 (60 wt.%).…”

Section: Kaolinite/tio 2 Composite Preparationmentioning

confidence: 99%

Effect of calcination temperature and calcination time on the kaolinite/tio2 composite for photocatalytic reduction of CO2

Reli¹,

Kočí²,

Matějka³

et al. 2012

GeoScience Engineering

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The kaolinite/TiO 2 composite (60 wt% of TiO 2 ) was prepared by thermal hydrolysis of a raw kaolin suspension in titanyl sulphate and calcined at different temperatures (600, 650 and 700°C) and for different times (1, 2 and 3 h). The obtained samples were characterized by XRPD, N 2 physical adsorption and SEM, and tested for photocatalytic reduction of CO 2 . The different calcination conditions did not influence TiO 2 phase composition, only slightly changed the specific surface area, and significantly affected crystallite size of kaolinite/TiO 2 composite. A higher temperature and longer duration of calcination lead to higher crystallinity of the powder. The photocatalytic results showed that the crystallite size determined the efficiency of kaolinite/TiO 2 photocatalysts. AbstraktKompozit kaolinit/TiO 2 (60 hm% TiO 2 ) byl připraven termální hydrolýzou suspenze surového kaolinu v síranu titanylu a kalcinován při různých teplotách (600, 650 a 700°C) a po různou dobu (1, 2 a 3 h). Získaný vzorek byl charakterizován pomocí XRPD, N 2 fyzikální adsorpcí a SEM, a testován na fotokatalytickou redukci CO 2 . Rozdíl kalcinačních podmínek neovlivnil složení fáze TiO 2 , pouze se mírně pozměnila specifická povrchová plocha a výrazně byla ovlivněna velikost krystalitu kompozitu kaolinit/TiO 2 . Vyšší teplota a delší doba kalcinace vedly k vyšší krystalitě prášku. Fotokatalytické výsledky ukázaly, že velikost krystality určuje účinnost fotokatalyzítoru kaolinit/TiO 2 .

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Preparation and characterization of photoactive composite kaolinite/TiO2

Cited by 121 publications

References 49 publications

Photodegradation of 1,2,4-Trichlorobenzene on Montmorillonite–TiO2 Nanocomposites

Photodegradation of 1,2,4-Trichlorobenzene on Montmorillonite–TiO2 Nanocomposites

Preparation and Performance of Modified Red Mud-Based Catalysts for Selective Catalytic Reduction of NOx with NH3

Effect of calcination temperature and calcination time on the kaolinite/tio2 composite for photocatalytic reduction of CO2

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